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The CNOC Cluster Survey: Omega, sigma_8, Phi(L,z) Results, and Prospects for Lambda Measurement

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arxiv astro-ph/9704060 v2 pith:UUX3NRTX submitted 1997-04-07 astro-ph

R. G. Carlberg , H. K. C. Yee , H. Lin , C. W. Shepherd , P. Gravel , E. Ellingson , S. L. Morris , D. Schade
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J. E. Hesser J. B. Hutchings J. B. Oke R. Abraham M. Balogh G. Wirth F. D. A. Hartwick C. J. Pritchet T. Smecker-Hane
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keywords clustersgalaxiesomegaclusterevolutionfieldgalaxylambda
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Rich galaxy clusters are powerful probes of both cosmological and galaxy evolution parameters. The CNOC cluster survey was primarily designed to distinguish between Omega=1 and Omega~0.2 cosmologies. Projected foreground and background galaxies provide a field sample of comparable size. The results strongly support a low-density universe. The luminous cluster galaxies are about 10-30% fainter, depending on color, than the comparable field galaxies, but otherwise they show a slow and nearly parallel evolution. On the average, there is no excess star formation when galaxies fall into clusters. These data provide the basis for a simple Lambda measurement using the survey's clusters and the field data. The errors in Omega_M, Lambda, sigma_8 and galaxy evolution parameters could be reduced to a few percent with a sample of a few hundred clusters spread over the 0<z<1 range.

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